Combine like terms.-10y2z + 3xy2 - 13y2z + 12
A. -3xy2 + 23y2z + 12
B. -3xy2 - 23y2z + 12
C. 3xy2 - 23y2z + 12
D. 3xy2 + 23y2z + 12
Answer: C
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A = 
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A. 
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?
where, 
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?
A. 
B. 
C. 
D. 
E. 